re: 2013 Suburban LT w/factory trailer pkg - while troubleshooting inoperative trailer back-up lites, I checked the 7-pin connector and found no voltage to the aux power terminal or the back-up lite terminal. I also checked the socket that feeds the connector - same results. Is there a relay / fuse to check upstream of the connector? Thanks, Jon C

 

Solved 1/2 the problem - fuse #10 (10A) was blown, now to find the Aux 12V......Jon

 

More Progress to Report re: missing 12V supply to 7-pin. I found the fuse (#68) for Stud 1 Trailer Battery Connector. - but no wire is connected to Stud 1. When I connected the trailer brake controller, I spotted it's loose lead and connected to Stud 2, but I don't see a loose wire for the 12V - where would it be located?

 

Here's a link for installing a brake controller in a 2011 Tahoe. Your connections may be the similar.
At 3:42 they show the connections to Stud #1 & #2.
https://www.etrailer.com/tv-install-...hoe-90195.aspx

 

Thank you, thank you!. Can't wait to get home to find that wire on the firewall. E-trailer vidoes are the best. I had watched an e-trailer video for my brake controller install back in '14, but that one didn't address the 12V wire, so I've gone for a number of years without the feature. Thanks again, especially for citing the "3:42".
Jon C

 

If this helps any...
https://chevroletforum.com/forum/tah...troller-78409/

 

Case Closed. With your assistance & video referral, I spotted the wire, made the connection and now have 12V at the 7-pin. Thank You!